Boiler-alarm



(No Model.)

J. J. GHEGAN.

BOILER ALARM.

No. 388,946. Patented June 5, 1888.

mmwwiwmmm UNITED STATES JOHN l. GHEGAN, OF NEVABQ, NEW;T JERSEY.

BOILER ses its]

SPECIFICATION forming part oi Letters Estant No. 383,945, dated June 5, 188?.

Application filed March 5, IFES.

T0 all whom t may concern,.-

Be it known that I, JOHN J. Garcin, of Newark, in the county of Essex, State of New Jersey, have invented au improvement in Boiler-Alarms,ofivhich the following is aspecihcation.

lzloileralarms have heretofore been made by ine in which a iloat is made use of in connection with a magnet, so that when said Heat is in proximity to the magnet-poles the magnetism is so influenced as to cause the deflection of aeircuitclosing device in which is a battery or alarm, and this is made use of te indicate either high or loiv Water in the boiler. Reference is hereby made to Letters Patent No. 355,875, granted to me January 11,1887, for an apparatus el' this kind. In introducing this apparatus li have found difficulty in obtaining a float that will resist the change of pressure and temperature Without any risk et' injury.

My present invention is for the purpose of obviatiug the diliculty arising from ordinary iloats becoming water-logged and thereby los ing their buoyancy, and to accomplish this i use a counter-balance in combination with a gravitating body, which may or may not be buoyant itseli'.

in the drawings, Figure l is a vertical section representing my said improvement as ap^ plied toa boiler, and Fig. 2 is a plan of the saine With the case in section.

The ease or holder A is connected tothe boiler B or other suitable reservoir in any desired manner. 'ihis ease A is represented as extending outward from the boiler or other reservoir B, and contains a balanced or vibratory bar, C, pivoted at S, the upright arm D of which is provided with magnetic material. The other arm, 7, extends into the reservoir normally above the Wateelevel, and is provided with a gravitating body, 5,' attached thereto by a chainff, and swivelX, orothersuitable means. The end G of the vibratory bar C, carrying the magnetic arm D, is the heavier, and serves to counter-balance the gravitating body 5,attaehed to the opposite end, 7. The arm D is not necessarily itselfl a magnet, but is simply composed of or provided with metal susceptible of influencing a permanent magnet, N S, located outside the casing A.

The gravitating body 5 maybe of any desired No model.)

form or material, provided that its Weight in proportion to that et" the counter-balance is such that it will outweigh or be outweighed thereby, according to theheight of the water.

N S represent a magnet pivoted at M Within an auxiliary casing, K, attached tothe outside of easing A, and provided with an electrical contact-point, c, arranged to close the circuit c through the terminal b when the magnet is attracted by arm D. The Wire Which goes to the battery l? passes through and is insulated at o from the auxiliary easing K. The other wire leading lfrom the bell Q back to the magnet connects with the easing A at the point 1. That part, A, ol' casings A and K which intervenes between the magnetic arm B and poles ofthe magnets N S is composed oi' nonmagnetic material.

7i is a limiting-stop, also composed of non magnetic material.

rlhe easings A and K, with the exception of the non-magnetic portion A', may be of magnotie material. A

Vhen the water in the boiler is at its normal level, the counter-balancing end G outweighs the gravitating body 5 and holds the vibratory bar and magnetic arm in the position shown in full lines in Fig. l. in this position the magnetic arm D is too far removed from the magnet-poles N S to overcome the attraction of the auxiliary casing, which keeps the magnet drawn against the back-stop h, thereby holding the circuit openV at the points a Z1, as shown more clearly in Fig. 2. As the gravitatiug body loses the support of the water by the latter receding therefrom, its weight on the vibratory arm increases, and when this weight becomes greater than that of the cena ter-balance it moves the latter to the position shown in dotted lines, bringing the magnetic arm D iu such close proximity to the magnetpoles N tl that the aforesaid attraction ot' the magnetic casing li is overcome and the mag net moves toward the arm D, thereby closing the electric circuit at a b (see dotted lines) and operating the bell or any suitable electric device contained in the circuit. As the Water rises to the proper level, the reverse operation takes place and the movable parts return to the position shown in full lines.

Hai/'ing thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In water-level alarms, the combination of a vibratory bar provided with a gravitating body and a counter-balance carrying magnetic n1aterial,with a liqnid-reservoir,electricalarm circuit, and magnetic-circuit controller, substantially as described.

2. In water-level alarms, a Huid-reservoir containing a gravitating body, in combination with a counter-balance and magnetic circuit controller, substantially as described.

3. In aj boiler-alarm, the combination of a fluid reservoir, a movable balance located within acasinghavinga non-magnetic portion, a Inagneticcircuit controller, a gravitating body connected with said balance, and an alarm-circuit, substantially as described.

JOHN J. GHEGAN.

Witnesses:

O. F. CoNLoN, JAMES A.. BERRY. 

